EFFECT OF HUMIDITY CONTROL OF FLUE GAS FROM COAL-FIRED POWER PLANTS ON PM<sub>2.5</sub> SAMPLING

HAN Donghang; LI Zhen; YAN Yulong; PENG Lin; LI Botao; ZHOU Yongqian; SHI Xiaolong; CHENG Yudong

doi:10.13205/j.hjgc.202312019

Volume 41 Issue 12

Dec. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(12): 158-165,277

HAN Donghang, LI Zhen, YAN Yulong, PENG Lin, LI Botao, ZHOU Yongqian, SHI Xiaolong, CHENG Yudong. EFFECT OF HUMIDITY CONTROL OF FLUE GAS FROM COAL-FIRED POWER PLANTS ON PM2.5 SAMPLING[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 158-165,277. doi: 10.13205/j.hjgc.202312019

Citation:

HAN Donghang, LI Zhen, YAN Yulong, PENG Lin, LI Botao, ZHOU Yongqian, SHI Xiaolong, CHENG Yudong. EFFECT OF HUMIDITY CONTROL OF FLUE GAS FROM COAL-FIRED POWER PLANTS ON PM_2.5 SAMPLING[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 158-165,277. doi: 10.13205/j.hjgc.202312019

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EFFECT OF HUMIDITY CONTROL OF FLUE GAS FROM COAL-FIRED POWER PLANTS ON PM_2.5 SAMPLING

doi: 10.13205/j.hjgc.202312019

1. MOE Key Laboratory of Resources and Environmental System Optimization, School of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China;
2. Engineering Research Centre of Clean and Low-Carbon Technology for Intelligent Transportation, Ministry of Education, School of Environment, Beijing Jiaotong University, Beijing 100091, China

Received Date: 2023-03-01
Available Online: 2024-03-08

Abstract

Abstract

In order to investigate the effect of relative humidity (RH) of high humidity flne gas after desulfurization on the sampling results of PM_2.5 concentration from coal-fired power plants, the diffusion dryers were used to control the RH of the flue gas. Particle size distribution, particle loss, and PM_2.5 mass concentration were determined with a variety of RHs. The results show that a higher RH of the flue gas led to an increase in the number and mass concentration of PM_2.5. For the RH of 40%, the mass concentration of PM_2.5 was 22.77 mg/m³ and the total number concentration of PM_2.5 was 1.16×10⁶ P/cm³. As the RH of the flue gas increased to 50%, 60%, and 80%, the mass concentration of PM_2.5 increased by 1.06, 4.35, 4.69 times; and the number concentration was increased by 1.31, 1.70, 1.76 times, respectively. When using a diffusion drying tube to dehumidify the simulated high-humidity flue gas, the mass concentration of particles collected decreased to varying degrees. At the highest relative humidity (94.9%), the mass concentration of PM_2.5 was 27.17 mg/Nm³, and at the humidity of 81.4%, 68.5%, 48.7%, 30.4%, the mass concentration was 14.5%, 28.8%, 43.0%, 45.7% lower than that at the highest humidity. Flue gas dehumidification reduced the loss of PM_2.5 in the pipeline and the cutting heads. The mass concentration of PM_2.5 collected at relative humidity of 94.9%, 81.4%, 68.5% was 3.02, 2.73, 2.57 times higher than that of the control group. High humidity flue gas dehumidification reduced the moisture content of particulate matter, resulting in a lower measurement result of PM_2.5 mass concentration. However, due to the reduction of particulate matter loss, the final collected PM_2.5 mass concentration was significantly increased.
- coal-fired power plant,
- flue gas humidity,
- PM_2.5 sampling,
- diffusion dryer,
- size distribution,
- particle loss

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References(39)

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